VESA FDMI Part B and C display mounts screw size
M4 · 6 to 8 mm long
The screws used on VESA FDMI Part B and C display mounts are M4 in lengths from 6 to 8 mm.
The record covers official spec: four 4mm diameter 0.7 pitch screws for 75x75 and 100x100 patterns.
This entry is marked confirmed and comes from glenwing.github.io.
For reference, M4 is 4 mm across the threads at 0.7 mm pitch. The imperial size people confuse it with: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
VESA FDMI Part B and C display mounts screw specifications
One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M4 | 6–8 mm | 0.7 mm | not stated | not stated | Official spec: four 4mm diameter 0.7 pitch screws for 75x75 and 100x100 patterns | Confirmed |
Fitment records and sources
Official spec: four 4mm diameter 0.7 pitch screws for 75x75 and 100x100 patterns
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- For a wall or arm mount, the screw has to engage the threaded insert by several turns but must not bottom out, so measure the insert depth and add the thickness of the bracket and any spacers.
- Diameter: across the threads an M4 screw measures about 4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.7 mm from one thread crest to the next (14.29 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The records span 6–8 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M4 heads take PH2 for Phillips and T20 for Torx, and a 3 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
- Tightening: no device-specific torque is published in these records. The site's general figure for M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4
- VESA thread size is set by pattern class: M4 for 75x75/100x100, M6 or M8 for the big 200mm+ patterns. Check the plate on the back of the display.
- Display mounts mix systems: the screen side is metric M4/M6, but the wall side of many mounts uses imperial wood screws such as #14 x 2.5in.
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Devices whose records share a thread with VESA FDMI Part B and C display mounts, closest length match first.
- Dell UltraSharp U2725QE monitor also M4 × 8 mm
- LG 55LM6400 also M4 × 8 mm
- Dell S2425H monitor also M4 × 8 mm
- Elo Z20 POS stand Gen2 (E378179) also M4 × 6 mm
- VESA MIS-B displays (4-7.9 inch) also M4 × 6 mm
- Dell Pro 24 Plus monitor (P2425DE) also M4 × 8 mm
- VESA FDMI MIS-D 75/100 display mount also M4 × 8 mm
- Elo touch display/signage panel (dimensional drawing MS602782) also M4 × 6 mm
Questions about VESA FDMI Part B and C display mounts screws
- What size screw does VESA FDMI Part B and C display mounts use?
- M4 × 6–8 mm for official spec: four 4mm diameter 0.7 pitch screws for 75x75 and 100x100 patterns.
- How long are the screws in VESA FDMI Part B and C display mounts?
- The records range from 6 to 8 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for VESA FDMI Part B and C display mounts?
- The sources do not name the drive. For M4, Phillips heads normally take PH2 and Torx heads T20; socket heads take a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.